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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5cb6900ba24be28ef3d0df93e2f126648447d4142e153bbb63d1c232c9c16ab' 
  AND token = 'HOPoTTsPpUmlt90gi15Da9c9aPQHOPRAQYmQh7fcx5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00102

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}